In fiction, you will see the most nastiest villain of the series who is outright evil and unbelievably mean often to the point of coming across as Complete Monster. Then, he gets defeated by the protagonist and the rest of his crew members. What happens next? He had a change of heart. He became repentant of all the crimes he has committed. And is now is a newest member of the heroes. This is a simple story of a baddie gone good.
Often at times, this doesn't usually has to be the case. When it comes to this trope, a character can go from evil to good and still retain their unpleasant characteristics they had as a villain. There are plenty of reasons for why his behavior is still the same despite changing the alignment. One, the reformed character may still have issues with one or more of the members of the group (particularly The Hero). Two, he is still hung on the ways of a villain and he was sour grapes on how he has changed his ways. Three, he may be just naturally mean due to the abuse of his parents or being picked on by children when he was younger. When it comes to this trope, turning over a new leaf is more complex than people wouldn't want it to be.
Here are the tropes which involve a character changing his alignment, but not his personality:
Sesshoumaru started as a villain trying to kill his own half-brother InuYasha, but turned into his protector due to taking a young orphan girl under his wing. This doesn't mean he really enjoys showing kindness to others, even Inu Yasha.
Much like the game's version, Shadow in Sonic X has pulled a Heel-Face Turn by sacrificing himself to save the world from the Space Colony ARK. In the Meterax saga, however, Shadow returns (with his memories erased), still the Perpetual Frowner, still cold and aloof around others, and still ruthless in his goals, even to the point of fighting Sonic and his friends if it's necessary.
Emma Frost from X-Men started as a villainess who is cold, aloof, arrogant, sociopathic, and likes to underdress. Even if she joins the team, nothing has changed about her attitude and behavior, although she seems to let her coldness melt a little.
Deadpool debuted as a mercenary villain in New Mutants and in X-Force. After the events, he still a mercenary, but evolves into a Heroic Comedic Sociopath who only does good deeds not because it was the right thing to do, but because either he felt like it or for selfish motives.
The film adaption of How the Grinch Stole Christmas! has the main character learning the true meaning of Christmas. Even so, he still behaves like a jerk, but his heart is still a half-size too small, so that's good enough for everyone.
As described on Nightside, Razor Eddie, "Punk God of the Straight Razor", is a reformed - but not retired - Serial Killer, who now targets those who threaten children and the homeless. He's been known to leave buildings soaked in blood but conspicuously absent of corpses; the narration calls him "an extremely disturbing agent of good. The forces of good didn't get a say in the matter".
Spike from Buffy the Vampire Slayer started off as a villain in season 2, but by season 3 (and a due to a dose of Badass Decay), he joined the Scoobies while still keeping his mean streak as a vampire.
Bialar Crais from Farscape was the Starter Villain for the first season chasing after the heroes until Scorpious came and take his place. While he underwent a Heel-Face Turn and backslid a couple of times, he never seem to lose his nasty streak.
This is quite common in the professional wrestling world. A good number of wrestlers begun their careers as heels, but were so loved by the fans that they just have to turn face despite still behaving the same way they started. A noticeable example is "Stone Cold" Steve Austin during the rise of his popularity.
Joshua Graham from Fallout: New Vegas actually had a Heel-Faith Turn after becoming one of the most ruthless and cruel men in the Legion. Even though he now fights for a noble cause, he still retains his ferocity and Kill 'em All mentality.
Sagat from Street Fighter aligns himself with Shadaloo after succumbing a loss to Ryu in the first SF tournament. He realizes that his revenge-driven desire in defeating Ryu isn't the right path, so in Street Fighter Alpha, he reforms from his ways, but still retains a heated yet healthy rivalry with Ryu.
The Star Wolf team in Star Fox started as a mercenaries and Evil Counterparts to The Star Fox team. They even worked for Andross in Star Fox 64 to take down Fox. In the later games, they graduate as Anti Heroes who will sometimes, and grudgingly, team up with Star Fox in their missions.
Another example is Princess Luna in the season 2 episode "Luna Eclipsed". Princess Luna still speaks in her booming voice early on, left over from her time at Nightmare Moon. This, combined with her past reputation as Nightmare Moon, makes every other pony scared of Luna.
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.